[WIP] Implement delegate inspection DacDbi APIs on cDAC

[Copilot]

Implements GetDelegateFunctionData and GetDelegateTargetObject in the managed cDAC DacDbi layer, on top of cherry-picked native commit 86d4004 which removes GetDelegateType and simplifies the two delegate APIs' signatures.

cDAC contract

• New IObject.GetDelegateInfo(addr, out methodPtr, out methodPtrAux, out invocationCount) implemented in Object_1 via a new Data.Delegate type. No version bump; no compat shims for older dumps.

Data descriptors

• cdac_data<DelegateObject> template + friend in src/coreclr/vm/object.h.
• New Delegate type in datadescriptor.inc with Target, MethodPtr, MethodPtrAux, InvocationList, InvocationCount.
• DataType.Delegate enum value.

DacDbi cDAC implementations

• DacDbiImpl.GetDelegateFunctionData / GetDelegateTargetObject implemented using the new contract + ExecutionManager, RuntimeTypeSystem, and Loader contracts. Delegate-kind branching (closed / open / multicast / wrapper) mirrors the native logic.
• Both follow the standard cDAC pattern: try/catch translating exceptions to HRs, plus #if DEBUG validation against the legacy implementation (Debug.ValidateHResult + Debug.Assert on outputs).
• Added CORDBG_E_UNSUPPORTED_DELEGATE HR constant.
• Vtable slot for the removed GetDelegateType is dropped in IDacDbiInterface.cs to match the native interface.

Native fix-up

• Fixed missing HRESULT declaration at divalue.cpp:2725 introduced by the cherry-pick.

Unit tests

• MockDelegateObjectData + AddDelegateObject helpers in MockDescriptors.Object.cs.
• Four ObjectTests cases for GetDelegateInfo: closed delegate, open delegate, multicast delegate, and null-address argument validation.

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